The Department of Energy suggests doing a careful visual inspection, looking for cracks or gaps around areas like outlets, door and window frames, baseboards and fireplace dampers. On a windy day ...

Tight inner connections for superb performance, with no gaskets or sealants required ... direct vent gas or propane stoves, heaters, and fireplaces.

For a new floating shelf installation without an existing mantel, you should plan for it to be about 3–4 inches wider than the fireplace on both sides. If you have a TV mounted over it, the mantel ...